Three beautiful concepts today, with equally beautiful uses!

Optimal Stopping Theorem

also known as Early Stopping Theorem

A theorem concerned with the problem of choosing a time to take a particular action, in order to maximise an expected reward or minimise an expected cost (i.e. optimal time to stop something, like dating for best chance at permanent or true love). Also widely used in statistics, economics, and mathematical finance. (Wikipedia)

Nerd Sniping

presenting someone, often a mathematician/physicist with a time consuming problem or challenge (often impossible to solve or complete) in the hopes of it appealing to a person’s obsessive tendencies, and/or cause harm from the distraction created.

Negativity Threshold

when the wife becomes so frustrated by her husband that she responds very negatively (low threshold is secret to a lasting relationship)